Ok I am having some issues with my steering and need some advice. My car is a 66 with manual steering and manual brakes. I've never owned a manual steering vehicle before but I know something is not right. When I first got the car I couldn't drive over 30 mph without the car swerving almost out of control. It would veer left or right and when I would correct it it'd nearly lose control. Since then I have replaced the upper & lower control arms, outter, inner & center tie rods, coil spring insulaters & saddles, front sway bar end links & strut rod bushings along with all new brakes. it has greatly improved but the problem is still there but now it does it at about 60-70 mph and it is very scary. I guess the only things I can do is replace the pitman arm, idler arm and steering box. Is this a common problem? Will replacing the old steering parts fix it? is it even worth having my box rebuilt? Is it hard to rebuild them? If i drive slow (5-10mph) & turn the wheel and let go it won't return to center, just keeps steering??? is this normal? any help would be great. Thank you.